Measuring small

Jillian • I was told I was infertile due to severe endometriosis. A few days before my scheduled hysterectomy... WE ARE PREGNANT!!
I went in for an ultrasound yesterday to look at our baby girls heart. Her defect has almost corrected itself and her hole is almost gone. But the dr told us that she is measuring small. And that my bump is measuring small as well. Which is crazy because i feel huge. I am 26 weeks and was told her heart problem probably didnt play a role in her size. Ive never smoked, dont drink alcohol or anything like that. I was told to drink a few bottles of ensure daily because my urine showed i was starting for calories, there were a lot of ketones in my urine. But my question is has anyone else measured small around the same time and eventually caught back up and any advice on what i can do to help with her growth? Thanks in advance.